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Enable RP1 PIO driver and add notes #43

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Jan 15, 2025
Merged

Enable RP1 PIO driver and add notes #43

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10 changes: 10 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,16 @@ cmd("amixer cset numid=3 2")

Change the last argument to `amixer` to `1` to output to the stereo output jack.

## RP1 PIO

The `rpi1-pio` device driver allows use of the PIO hardware using
[`piolib`](https://github.com/raspberrypi/utils/tree/master/piolib). If you
don't see `/dev/pio0`, the most likely cause is that you need to update your
Raspberry Pi's boot EEPROM. See
[rpi-eeprom](https://github.com/raspberrypi/rpi-eeprom) for binaries. It may be
easier to upgrade the EEPROM via RaspberryPi OS if the instructions aren't
clear.

## Provisioning devices

This system supports storing provisioning information in a small key-value store
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3 changes: 2 additions & 1 deletion linux-6.6.defconfig
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Expand Up @@ -160,6 +160,7 @@ CONFIG_RASPBERRYPI_FIRMWARE=y
CONFIG_OF_CONFIGFS=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_RAM=y
CONFIG_RP1_PIO=y
CONFIG_EEPROM_AT24=m
CONFIG_SCSI=y
# CONFIG_SCSI_PROC_FS is not set
Expand Down Expand Up @@ -274,7 +275,6 @@ CONFIG_INPUT_EVDEV=y
# CONFIG_INPUT_KEYBOARD is not set
# CONFIG_INPUT_MOUSE is not set
CONFIG_INPUT_JOYSTICK=y
CONFIG_JOYSTICK_RPISENSE=m
CONFIG_INPUT_TOUCHSCREEN=y
CONFIG_TOUCHSCREEN_EDT_FT5X06=m
CONFIG_TOUCHSCREEN_RASPBERRYPI_FW=m
Expand Down Expand Up @@ -476,6 +476,7 @@ CONFIG_COMMON_CLK_RP1_SDIO=y
CONFIG_CLK_RASPBERRYPI=y
CONFIG_MAILBOX=y
CONFIG_BCM2835_MBOX=y
CONFIG_MBOX_RP1=y
CONFIG_BCM2712_IOMMU=y
CONFIG_RASPBERRYPI_POWER=y
CONFIG_PWM=y
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